head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
A medieval-flavored Doom prequel built around shield parries and heavy combat.

Execution · Practiced Mastery
The 32-bit X series highlight where Zero becomes fully playable with his own saber-based campaign.
Doom: The Dark Ages leans Execution (Practiced Mastery); Mega Man X4 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Parry timing and shield play demand precise inputs
Mega Man X4
Dash-jump mobility and Zero's saber combos test hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Demon attack patterns are fixed and learnable
Mega Man X4
Mavericks follow fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Encounters fully scripted
Mega Man X4
Upgrade capsule locations hidden initially
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Upgrade paths and combat-loop mastery solve fights
Mega Man X4
Armor parts, weakness order, and X-vs-Zero routing
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.